@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-display: swap;
  font-weight: 400;
  src: url("/fonts/ibm-plex-sans-latin-ext-400-normal.woff2") format("woff2");
  unicode-range: U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF;
}
@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-display: swap;
  font-weight: 400;
  src: url("/fonts/ibm-plex-sans-latin-400-normal.woff2") format("woff2");
  unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}
@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-display: swap;
  font-weight: 500;
  src: url("/fonts/ibm-plex-sans-latin-ext-500-normal.woff2") format("woff2");
  unicode-range: U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF;
}
@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-display: swap;
  font-weight: 500;
  src: url("/fonts/ibm-plex-sans-latin-500-normal.woff2") format("woff2");
  unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}
@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-display: swap;
  font-weight: 600;
  src: url("/fonts/ibm-plex-sans-latin-ext-600-normal.woff2") format("woff2");
  unicode-range: U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF;
}
@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-display: swap;
  font-weight: 600;
  src: url("/fonts/ibm-plex-sans-latin-600-normal.woff2") format("woff2");
  unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}
@font-face {
  font-family: "IBM Plex Mono";
  font-style: normal;
  font-display: swap;
  font-weight: 400;
  src: url("/fonts/ibm-plex-mono-latin-400-normal.woff2") format("woff2");
}

:root {
  color-scheme: light;
  --color-bg: #ffffff;
  --color-surface: #ffffff;
  --color-surface-2: #f6f7f9;
  --color-surface-3: #eef1f4;
  --color-border: #e2e5ea;
  --color-border-soft: #edeff2;
  --color-ink: #18212e;
  --color-ink-2: #58616e;
  --color-ink-3: #79828f;
  --color-ink-4: #aeb6c0;
  --color-brand: #294056;
  --color-brand-2: #1d2d3d;
  --color-brand-tint: rgba(41, 64, 86, 0.06);
  --color-accent: #2f6fdc;
  --color-accent-soft: #eaf1fd;
  --color-accent-soft-2: #dbe8fb;
  --color-ok: #1c6b3a;
  --color-ok-bg: #e7f4ea;
  --color-ok-border: #bfe0c9;
  --color-warn: #8a5200;
  --color-warn-bg: #fdf2e0;
  --color-warn-border: #f0cf94;
  --color-err: #a3232f;
  --color-err-bg: #fde7e9;
  --color-err-border: #f1b6bc;
  --color-hint: #1d4d7f;
  --color-hint-bg: #e9f1fa;
  --color-hint-border: #a9caec;
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius: 8px;
  --radius-lg: 12px;
  --radius-pill: 999px;
  --sh-1: 0 1px 2px rgba(20, 30, 45, 0.06), 0 1px 3px rgba(20, 30, 45, 0.05);
  --font-sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --fs-display: 27px;
  --fs-title: 19px;
  --fs-h: 15px;
  --text-md: 15px;
  --text-base: 13.5px;
  --text-sm: 12.5px;
  --text-xs: 11.5px;
  --s1: 4px;
  --s2: 8px;
  --s3: 12px;
  --s4: 16px;
  --s5: 20px;
  --s6: 24px;
  --s7: 32px;
  --s8: 40px;
}

* { box-sizing: border-box; }
html { background: var(--color-bg); }
body {
  min-height: 100vh;
  margin: 0;
  color: var(--color-ink);
  background: var(--color-surface-2);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-variant-numeric: tabular-nums;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
button, input, textarea { font: inherit; }
button { color: inherit; }
code, .wordmark, .section-label, .mission-number, .locked-label, .footer-brand {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}
:focus-visible {
  border-radius: 2px;
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.app-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}
.app-header-inner {
  display: flex;
  min-height: 64px;
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
  align-items: center;
  justify-content: space-between;
  gap: var(--s4);
  padding: var(--s3) 0;
}
.brand-context { display: flex; min-width: 0; align-items: center; gap: var(--s3); }
.wordmark {
  display: flex;
  min-width: 0;
  margin: 0;
  align-items: center;
  white-space: nowrap;
  color: var(--color-ink);
  font-size: var(--text-sm);
  font-weight: 500;
}
.brand-chip {
  display: inline-flex;
  flex: 0 0 auto;
  margin-right: 7px;
  padding: 1px 7px;
  align-items: center;
  border-radius: var(--radius-xs);
  color: white;
  background: var(--color-brand);
  font-weight: 600;
}
.context-separator { color: var(--color-ink-4); }
.header-context { overflow: hidden; color: var(--color-ink-2); font-size: var(--text-sm); font-weight: 500; text-overflow: ellipsis; white-space: nowrap; }

.mission-intro {
  border-bottom: 1px solid var(--color-accent-soft-2);
  background: var(--color-accent-soft);
}
.mission-intro-inner {
  display: flex;
  width: min(1040px, calc(100% - 48px));
  margin: 0 auto;
  align-items: center;
  justify-content: space-between;
  gap: var(--s7);
  padding: var(--s4) 0;
}
.mission-intro h2 { margin: 2px 0 0; color: var(--color-brand); font-size: var(--fs-display); font-weight: 600; line-height: 1.2; }
.mission-intro p:last-child { max-width: 570px; margin: 0; color: var(--color-ink-2); font-size: var(--text-sm); }
.section-label { margin: 0; color: var(--color-accent); font-size: var(--text-xs); font-weight: 600; letter-spacing: .06em; text-transform: uppercase; }

main { width: min(1040px, calc(100% - 48px)); margin: var(--s6) auto var(--s8); }
.journey-nav {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 1px;
  margin-top: var(--s4);
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-border);
  box-shadow: var(--sh-1);
}
.journey-nav a {
  display: flex;
  min-width: 0;
  min-height: 52px;
  align-items: center;
  gap: var(--s2);
  padding: var(--s2) var(--s3);
  color: var(--color-ink-2);
  background: var(--color-surface);
  font-size: var(--text-xs);
  font-weight: 500;
  line-height: 1.2;
  text-decoration: none;
}
.journey-nav a:hover { color: var(--color-accent); background: var(--color-accent-soft); }
.journey-nav a span {
  display: grid;
  width: 23px;
  height: 23px;
  flex: 0 0 auto;
  place-items: center;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  color: var(--color-brand);
  background: var(--color-surface-2);
  font-family: var(--font-mono);
}
.boundary {
  display: flex;
  gap: var(--s3);
  align-items: flex-start;
  padding: var(--s3) var(--s4);
  border: 1px solid var(--color-hint-border);
  border-radius: var(--radius-lg);
  color: var(--color-ink-2);
  background: var(--color-hint-bg);
  font-size: var(--text-sm);
}
.boundary strong { display: block; margin-bottom: 1px; color: var(--color-hint); font-size: var(--text-base); font-weight: 600; }
.boundary-marker {
  display: grid;
  width: 20px;
  height: 20px;
  flex: 0 0 auto;
  place-items: center;
  border: 1px solid var(--color-hint-border);
  border-radius: 50%;
  color: var(--color-hint);
  background: var(--color-surface);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
}

.mission {
  margin-top: var(--s5);
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--sh-1);
}
.mission-heading {
  display: flex;
  align-items: center;
  gap: var(--s3);
  padding: var(--s4) var(--s5);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface-2);
}
.mission-heading h2 { margin: 0 0 2px; color: var(--color-brand); font-size: var(--fs-title); font-weight: 600; line-height: 1.2; }
.mission-number {
  display: inline-flex;
  min-width: 42px;
  height: 30px;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-accent-soft-2);
  border-radius: var(--radius-pill);
  color: var(--color-accent);
  background: var(--color-accent-soft);
  font-size: var(--text-sm);
  font-weight: 600;
}
code {
  padding: 2px 6px;
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-xs);
  color: var(--color-brand);
  background: var(--color-surface-3);
  font-size: var(--text-sm);
}
.request-pair { display: flex; flex-wrap: wrap; gap: var(--s2); }
.meta-note { color: var(--color-ink-3); font-size: var(--text-sm); }

form.prediction { margin: 0; padding: var(--s5); }
[data-observation-panel] { padding: 0 var(--s5) var(--s5); }
label, .field-label { display: block; color: var(--color-ink); font-weight: 500; }
textarea, input[type="text"], input:not([type]) {
  width: 100%;
  min-height: 40px;
  margin-top: var(--s1);
  padding: 8px 11px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-ink);
  background: var(--color-surface);
  transition: border-color .14s ease, box-shadow .14s ease;
}
textarea { min-height: 84px; resize: vertical; }
textarea:hover, input[type="text"]:hover, input:not([type]):hover { border-color: var(--color-ink-4); }
textarea:focus, input[type="text"]:focus, input:not([type]):focus {
  border-color: var(--color-accent);
  outline: 2px solid var(--color-accent-soft-2);
  outline-offset: 0;
}

.button {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 0 var(--s5);
  border: 1px solid var(--color-brand);
  border-radius: var(--radius-pill);
  color: white;
  background: var(--color-brand);
  box-shadow: var(--sh-1);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: color .14s ease, background .14s ease, border-color .14s ease;
}
.button:hover { border-color: var(--color-brand-2); background: var(--color-brand-2); }
.button:disabled { cursor: wait; opacity: .45; }
.button-ghost {
  min-height: 36px;
  padding: 0 var(--s3);
  border-color: transparent;
  color: var(--color-ink-2);
  background: transparent;
  box-shadow: none;
  font-size: var(--text-sm);
}
.button-ghost:hover { border-color: transparent; color: var(--color-ink); background: var(--color-brand-tint); }

.field-help { margin: var(--s1) 0 var(--s3); color: var(--color-ink-3); font-size: var(--text-sm); }
.prediction-locked {
  margin: var(--s4) var(--s5) 0;
  padding: var(--s3) var(--s4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface-2);
}
.locked-label { margin: 0; color: var(--color-ink-3); font-size: var(--text-xs); font-weight: 600; letter-spacing: .05em; text-transform: uppercase; }
.prediction-text { margin: var(--s1) 0; color: var(--color-ink); font-size: var(--text-md); white-space: pre-wrap; }
.prediction-locked .field-help { margin-bottom: 0; }

.intellij-step {
  display: flex;
  gap: var(--s3);
  align-items: center;
  margin: var(--s4) 0;
  padding: var(--s3) var(--s4);
  border: 1px solid var(--color-warn-border);
  border-radius: var(--radius);
  color: var(--color-ink-2);
  background: var(--color-warn-bg);
  font-size: var(--text-sm);
}
.intellij-step span { color: var(--color-warn); font-family: var(--font-mono); font-size: var(--fs-h); font-weight: 600; }
.intellij-step p { margin: 0; }
.intellij-step strong { color: var(--color-warn); font-weight: 600; }

fieldset { margin: 0; padding: 0; border: 0; }
fieldset > legend { margin-bottom: var(--s2); padding: 0; color: var(--color-brand); font-size: var(--fs-h); font-weight: 600; }
.field { margin: var(--s3) 0; }
.field-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--s3); margin-top: var(--s1); }
.field-grid label span { color: var(--color-ink-3); font-size: var(--text-sm); font-weight: 400; }
.two-columns { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s4); }
.choice-group {
  margin: var(--s4) 0;
  padding: var(--s3) var(--s4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface-2);
}
.choice-group legend { margin: 0; color: var(--color-ink); font-size: var(--text-base); font-weight: 500; }
.choice-group label { display: inline-flex; align-items: center; gap: var(--s2); margin: var(--s3) var(--s5) 0 0; color: var(--color-ink-2); font-weight: 500; }
.choice-group input { width: 16px; height: 16px; accent-color: var(--color-accent); }
.legend-note { color: var(--color-ink-3); font-size: var(--text-sm); font-weight: 400; }
.comparison-grid, .resource-map, .summary-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--s4);
}
.comparison-card, .resource-map article {
  padding: var(--s4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface-2);
}
.comparison-card > code { display: inline-block; margin-top: var(--s1); }
.resource-map article > p { margin: var(--s2) 0; color: var(--color-ink-2); }
.checkbox-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 var(--s3); }
.checkbox-grid label { margin-right: 0; }
[data-activity="summary"] [data-observation-panel] { padding-top: var(--s5); }

.feedback {
  min-height: 19px;
  margin: var(--s1) 0 0;
  padding: 2px 0 2px var(--s2);
  border-left: 2px solid transparent;
  font-size: var(--text-sm);
}
.feedback:empty { min-height: 0; padding: 0; }
.feedback-pass { border-left-color: var(--color-ok-border); color: var(--color-ok); }
.feedback-fail { border-left-color: var(--color-err-border); color: var(--color-err); }
.result {
  min-height: 0;
  margin: var(--s4) 0 var(--s3);
  padding: 10px var(--s3);
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: var(--text-sm);
  font-weight: 500;
}
.result:empty { display: none; }
.result-pass { border-color: var(--color-ok-border); color: var(--color-ok); background: var(--color-ok-bg); }
.result-fail { border-color: var(--color-err-border); color: var(--color-err); background: var(--color-err-bg); }

[hidden] { display: none !important; }
footer {
  display: flex;
  min-height: 56px;
  align-items: center;
  justify-content: center;
  gap: var(--s3);
  padding: var(--s3) var(--s6);
  border-top: 1px solid var(--color-border);
  color: var(--color-ink-3);
  background: var(--color-surface);
  font-size: var(--text-xs);
}
.footer-brand { color: var(--color-brand); }

@media (max-width: 680px) {
  .app-header-inner, .mission-intro-inner, main { width: min(100% - 24px, 1040px); }
  .app-header-inner { min-height: 56px; }
  .header-context, .context-separator { display: none; }
  .button-ghost { max-width: 138px; text-align: right; }
  .mission-intro-inner { display: block; padding: var(--s3) 0; }
  .mission-intro h2 { font-size: 23px; }
  .mission-intro p:last-child { margin-top: var(--s2); }
  main { margin-top: var(--s3); }
  .journey-nav {
    display: flex;
    overflow-x: auto;
    scroll-snap-type: x proximity;
  }
  .journey-nav a { min-width: 132px; scroll-snap-align: start; }
  .mission { margin-top: var(--s3); }
  .mission-heading { align-items: flex-start; padding: var(--s3) var(--s4); }
  form.prediction { padding: var(--s4); }
  [data-observation-panel] { padding: 0 var(--s4) var(--s4); }
  .prediction-locked { margin: var(--s3) var(--s4) 0; }
  .field-grid, .two-columns, .comparison-grid, .resource-map, .summary-grid { grid-template-columns: 1fr; gap: var(--s1); }
  .checkbox-grid { grid-template-columns: 1fr; }
  .button:not(.button-ghost) { width: 100%; }
  footer { display: grid; gap: 2px; text-align: center; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: .01ms !important; }
}